The flashlight as a personal safety tool

Ask people what they would carry for personal protection and a flashlight rarely comes up. It should come up first. Personal safety is mostly about noticing trouble in time to avoid it, and in the dark that is impossible without light. A good pocket light does its most important work before anything has gone wrong, by showing you what is in the stairwell, behind the parked van or at the end of the path.

Why it earns a place in everyday carry

Legal everywhere. No U.S. state restricts carrying an ordinary flashlight, and it goes where other tools cannot: into offices, schools and aircraft cabins. The Transportation Security Administration permits flashlights in both carry-on and checked bags.

Unremarkable. A light that slips out of a coat pocket on a bus draws no attention at all. Oversized “tactical” models with crenellated bezels are the exception; they look like what they are meant to suggest, and they can cause problems in places a plain light never would.

Light where the danger is. Parking garages, alleys, unlit driveways and building entrances are where people get surprised, precisely because they are dark. Sweeping a beam across them removes the hiding places before you walk into them. At home in a power cut, the same light finds the breaker panel, the stairs and the children.

Time to leave. A bright beam in someone’s face makes their pupils clamp down and leaves an afterimage for a few seconds. That is not a way to win a fight. It is a way to make an approaching stranger stop, blink and think again while you put distance between yourself and them and head toward people and light. Police use a light in the face at traffic stops for a milder version of the same reason: it is disorienting, and it keeps the officer’s position hard to read.

Animals. Loose dogs and wildlife at night generally dislike a bright light pointed at them, and many will back off. It also shows you what the animal is before you get close enough to find out the hard way.

Being seen. Walking on a road shoulder at night, a light in hand makes drivers notice you far sooner than dark clothing will.

Two cautions. Do not shine a bright light at drivers, cyclists or aircraft, and do not use it on people who are simply passing by. And a light is a reason to leave early, not a reason to stay and confront.

What to look for

Pocket size. The light has to be on you to help. A big light kept under the car seat does nothing on a dark sidewalk.

Enough output. In 2011, 100 lumens was the benchmark for a light bright enough to startle; a single-cell pocket light today often reaches 500 to 1,000 lumens or more. Look for figures tested to the ANSI FL1 standard, which also reports runtime, beam distance, drop resistance and water resistance in comparable terms. A low mode matters as much as the high one, both for battery life and for reading a map without ruining your night vision.

A simple switch. A tail-cap button that gives instant momentary light with one press, without cycling through strobe or dim modes first, is the easiest to use under stress.

LED. LEDs replaced incandescent bulbs for good reason: they last far longer, survive drops and draw much less from the battery.

A tough body. Hard-anodized aluminum (the military Type III finish) is light and strong enough to keep working after being dropped on concrete or kicked across a floor.

Sealing. O-rings at both ends keep water out. An IPX7 or IPX8 rating means the light survives immersion.

A known maker and spares. Cheap copies fail at switches and seals. Buy from an established brand, then keep spare batteries and O-rings with your supplies. Decide between disposable CR123A lithium cells, which store for years, and rechargeable 18650 or 21700 cells, which need a charger and occasional topping up. Spare lithium batteries belong in carry-on luggage, not checked bags.

Size and brightness then and now

The shortlist recommended in 2011 was a handful of compact LED lights that were new at the time: the SureFire E2D LED Defender, Fenix TK12, EagleTac T20C2, Olight M20S and JetBeam RRT-2. Most have since been replaced by newer models. The comparison that went with them still makes the point. Set side by side with a four-D-cell incandescent Maglite, the palm-sized SureFire was a fraction of the size and weight, and from about 50 feet across a dark yard it threw a whiter, brighter beam than the big light’s yellow pool.

Fifteen years on the gap is wider. A light the size of a lipstick now outshines the old four-cell by several times, and there is no longer any trade-off between carrying something small and having real light when it is needed.

Further reading

Flashlight enthusiasts maintain long-running forums that test and compare lights in far more detail than any buyer needs. They are worth a search before spending money on an expensive model.